Mean severity ratings and DAPI test results for various ash trees growing in cultivation and the wild in Arizona that were surveyed for ash decline in fall 1992.
| Species/cultivar | No. of trees surveyed | Percentage with symptoms | Mean severity rating* | Percentage DAPI positive |
|---|---|---|---|---|
| Fraxinus velutina, wild type | 57 | 19.3 | 1.21 | 27.1 |
| F. velutina ‘Modesto’ cultivated in Tempe | 108 | 100.0 | 4.10 | 76.9 |
| F. velutina ‘Modesto’ cultivated outside Phoenix metropolitan area | 26 | 57.7 | 2.27 | 50.0 |
| F. velutina ‘Rio Grande’ cultivated in Tempe | 50 | 6.0 | 1.06 | 33.3 |
| F. uhdei cultivated in Tempe | 50 | 0.0 | 1.0 | 38.9 |
↵* Mean severity rating = Σ class ratings ÷ number of individuals rated.